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https://issues.apache.org/jira/browse/SOLR-17947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18036642#comment-18036642
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David Smiley commented on SOLR-17947:
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In my view, CloudSolrClient should never block a request simply because of a
stale cache entry. Even no cache entry -- it can send it to any node
arbitrarily (with consideration of node roles). _In the background_ it can
keep its caches up-to-date.
> CloudSolrClient async state refresh
> -----------------------------------
>
> Key: SOLR-17947
> URL: https://issues.apache.org/jira/browse/SOLR-17947
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud, SolrJ
> Affects Versions: 9.9
> Reporter: Mark Robert Miller
> Assignee: Mark Robert Miller
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> * replace striped locks with single-flight cache refresh futures to stop
> thundering herd
> * keep stale entries usable while background refresh runs, update retry
> semantics accordingly
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